Hi Aquaracer,
In my opinion there is a difference between depositing and investing funds, where you place you monies should reflect your security and access requirements and also what return you wish and what level of risk you are prepared to accept to achieve this growth.
Security and Access can be guaranteed, growth within an investment unless it is a deposit account cannot. Another area to look at is tax efficiency, If I was you I would sit down with an independent adviser to go through your options, don't deal with someone in your own bank !!!!